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  1. #include <stdio.h>
  2. //練習問題G
  3.  
  4. int func(int n){
  5.     int a, b=2, c=1;
  6.     int i;
  7. if(n==1){
  8. 	return 1;
  9. }
  10. else if(n==2){
  11. 	return 2;
  12. }
  13. else 
  14. for(i=2;i<n;i++){
  15. a=-2*b+2*c;
  16. c=b;
  17. b=a;
  18. }
  19. return a;
  20.  
  21.  
  22. }
  23. int main(void) {
  24. 	int n = 3;
  25. 	int x;
  26. 	x=func(n);
  27.     printf("数列anについて, n=%dのときの値は%d\n", n, x);
  28. 	return 0;
  29. }
  30.  
Success #stdin #stdout 0s 5320KB
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Standard input is empty
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数列anについて, n=3のときの値は-2
https://ideone.com/1H1xyE
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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